Apparatus for bending sheet or strip metal



25, 1934- c. G. L; SJOLANDER APPARATUS FOR BENDING SHEET OR STRIP METAL 8 Sheets-Sheet l Carl Cwsfing Leon rd jblandar VENTOR,

Dec. 1934- c. G. L.'SJC5LANDER Filed Jan. 18, 1932 APPARATUS FOR BENDING SHEET OR STRIP METAL 8 Sheets-Sheet 2 Carl Causing 'Laonard j and r INVENTOR;

' A thrnay.

Dec- 1934- c. G. L. SJOLANDER APPARATUS FOR BENDING SHEET OR STRIP METAL Filed Jan. 18, 1952 8 Sheets-Shee't 3 Car! 605%; Leonard 5 H :1 n-akf INVENTOR;

Myrna Dec. 25, 1934. L, SJQLANDER 1,985,385

APPARATUS FOR BENDING SHEET OR STRIP METAL Filed Jan. 18, 1952 8 Sheets-Sheet 4 lNVE-NTOR; ca-vl Quake Leo ard bjlqnder Dec. 25, 1934.

c. G. L. SJOLANDER 1,985,385

APPARATUS FOR BENDING SHEET OR STRIP METAL Filed Jan. 18, 1952 8 Sheet-Sheet 5 P17. 5 fig 5 1 17117 zzzfl- If 3a 14 35 l\ W [a Carl fi uishs Leonafd sjl na r NVENTOR;

Ami-nay.

934- Q c. G. LpSJGLANDER 1,935,385.

APPARATUS FOR BENDING SHEET OR STRIP METAL Filed Jan. 18, 1932 8 Sheets-Sheet 6 Dec. 25, 1934- c. G. L. SJOLANDER APPARATUS FOR BENDING SHEET OR STRIP METAL Filed Jan. 18, 1932 8 Sheets-Sheet 7 C G f Leonard fi mnder qvEN 1 UK KM Amway.

Dec. 25, 193

C. G. L. SJOLANDER APPARATUS FOR BENDING SHEET OR STRIP METAL Filed Jan. 18, 1952 8 Sheets-Sheet 8 Patented Dec. 25, 1934 UNITE-DVST'ATEH'IS PATENT" OFFICE- Carl Gustaf Leonard Sjtilander, G ottenborg,

' -Sweden Application January 18, 1932, SeriallNoL 531,314

13 Claims. 153-42).

Toform mouldings of different shapes from Fig.8 shows a sheet metal provided with a strip metal in long length which mouldings are shaped border manufactured according to the frequently used for buildings, furniture and other method in question; I r I purposes, or to provide sheet metal with shaped Figs. 9 to Marc vertical cross-sections through bordersit has hitherto been necessary to'treat the tools suitable for manufacturing said border; 5

the said metal either in rolling mils, which proc- Fig. 15 shows a 'strip'metal treatedaccording ess was employed especially for transforming strip to the methodj metal, or to use presses of various kinds, whereby Figs.'16 to 21 are vertical cross-sections through the material, depending upon the more or less the tools suitable for manufacturing said mouldcomplicated shape of its cross-section, must pass ing; 1

through a more or less considerablenumber of Fig. 22 shows another sheet metal provided rolls or to be treated by a more or less considerwith a border of another shape; able number of pressing or bending tools and. dies, u Figs. 23 to 30 are vertical cross-sections through the exchange of which means waste of time and of the tools suitablefor manufacturing said border;

productive labour, thus increasing the manufac- Fig; 31 shows another strip metal formed to 15 curing costs. Moreover, whatever rolling mills, shape according to the method, and presses, tools or dies are used, the work to be per- Figs. 32-to37 are vertical cross-sections of the formed requires intricate devices and demands, tools suitable for manufacturingsaid moulding. owing to the nature of methods employed, 0011- The -means for embodying the invention desiderable time, as the machines in question do not scribed hereinafter and illustrated in the draw- 0 permit'to exceed a certain, relatively low speed ings diagrammatically and by way of example of operation. a comprises a press, tools andfeeding means for The present invention has for its object to the metal which operates i'n-the following way:

eliminate the disadvantages and inconveniences Upon the body 1 of the pressa's shown in Figs.

mentioned and to permit asubstantial increase in 1, 2 and 3 a crankshaft 2' fitted'with'a flywheel 25 working speed amounting to a large increase in 3and driven by means of any kind is turnably the speed hitherto found possible, and provides journalled in any suitable way. From the crankmeans for gradually feeding the sheet or strip shaft 2 reciprocating movements are transmitted metal to be treated step by step into and be-- 'by-means of a connecting rod 41 to a knee joint '7 7 3O tween one or more tools having reciprocating consisting of two levers 5, 6. The'lower lever movement and intermittently exerting pressure 5 isswingable in a bearing 8 which is designed on opposite sides of said metal to form gradually as an adjustable slide, which by means ofa'screw progressing transformation in cross-section of the device 9 can be lengthwise displaced upon the treated metal. I lower sliding plate 10.

The accompanying drawings show diagram- This displacement: can be performed by any 35 matically and byway of example some embodisuitable means, for instance as shown in Figs. ments of the means suitable for performing the 3 and 4 by a plane sliding plate 10 provided with method, wherein: alongitudinal diagonally arranged groove 10a,

Fig. 1 is a front view of a suitable press; in which fits a corresponding tongue 8a on the Fig. 2 is a vertical elevation of said press, viewed lower plane surface of thebearing 8. When dis- 40 from the right end in Fig.1; placing the sliding plate 10 by means of the Fig. 3 is a similar elevation viewed from the screw device 9, the bearing 8 will be forced transleft end in Fig. 1, partly in section; versely of the plate 10. As a stopping device 101) Fig. '4 shows the device for adjusting the tool is provided, the bearing 8 will be prevented from 45 on a larger scale; moving in longitudinal direction and perform a 45 Fig. Fla is another embodiment of said device; transversal movement only, by which the lever Fig. -5 shows the knee-joint device of the press 5 will be more or less inclined and the tool support together with holding devices for the tools on a 12 lowered or raised to' adjust the tool. larger s l in vertical ection; According to another embodiment; shown in Fig. 6 shows the feeding means for the metal Fig. 4a, the adjustment of the tool can be effected 5 to be treated together with the tool, in front view; by means of inclined planes. In this case the Fig. 7 shows the holding devices for the tool, on sliding plate 10 is tapered and provided with a a larger scale, with inserted tools and between longitudinal groove 10a, cooperating with the them a metal to be treated, all in vertical crosstongue 8a on the inclined lower surface of the section; a W 4 l bearings, which can slide upon the sliding plate upon the body 1 and thereupon guided by means I of guides or the like. The slide 11 is, according to the embodiment, on its upperportion arranged as a support 12 for the tools, in which support can be inserted one part 14 of the tools, which in the following will be more particularly described. The other part 15 of the tool is placed in a tool holder 13 located on the body -1. This latter part of the tool is secured to the tool holder by means of screw spindles 17 provided with hand wheels 16, which screw spindles also serve for adjusting the tool; The lower part 14 which is without special fixing devices is disposed in, a groove or the like provided in the support 12.

When, rotating the shaft 2, the slide 11 and consequentlygthe support 12 will be reciprocated by means of the connecting rod 4 and the levers 5, 6, the parts 14 and 15 of the tool being alternately moved toward and away from one another, whereby press Work is effected upon opposite sides of the metal interposed between the tools.

The metal 18 to be treated, is fed into the press from the right (Figs. 1 and 6) and inserted between the parts 14 and 15 of the tool. According to the embodiment shown, the feeding means consist of four pairs of'feed rollers 19, between everytwo pairs of which one of the sections 24, 25, 26, is placed into which the tool in the present case is divided. Each of these sections consists of a lower part 14 and an upper part 15, the corresponding parts of which co-operate with one anotherx Obviously, it is not necessary to divide the tool in sections, but it can consist of a single, undivided length; on the other hand it is also possible to arrange two, three or still more sections, if the final shape of the metal should require more intricate tools, Nor is it necessary to interpose feed rollers between every two sections, but the number of those rollers depends upon the type of work to be done in the press.

According to the embodiment shown in the drawings, the lower feed rollers '19 (Figs. 1 and 6) are adjustable in type by means of worm gears, (not shown in the drawings) and driven by the handwheels 20, so that the distance between the lower rollers and the upper ones can easily be adjusted so as to suit different thicknesses of the metal to be treated. It is also possible to arrange similar adjusting devices for the upper rollers, so that either of them may be adjusted, but in the present case only the lower feed rollers are adjustable, whilst the upper rollers are rigidly journalled.

The following arrangements are made in order to obtain the required gradual step by step feeding of the metal 18; b

Upon the crank shaft 2 a slotted disc 21 is provided, on which a crank pin 22 is slidably journalled so that its distance from the centre of the crank shaft 2 can be changed. The rotating movement of the crank shaft 2 is transformed into reciprocating movements by means of a connecting rod 23 designed as a gear rack, co-operating with a gear wheel, which by means of a ratchet device or the like actuates a worm earing (said gear wheel and said worm gearing being not shown in the drawing), in such a way, that the feed rollers 19 connected to the said worm gearing will turn intermittently. By adjusting the crank pin 22 nearer to or farther from the centre of the crank shaft 2, it is possible to moderate the gradual intermittent feeding, so that at each lowering of the support 12 by means of the levers 5, 6, the feed rollers are rotating and thus feeding a more or less long portion of the metal 18.

' The movement (the lifting and lowering) of the support 12 and the rotation of the feed rollers 19 are mutually arranged in such a way, that the feed roller-$.19 only rotate, when the support j is lowering, while their rotation is interrupted,

and consequently the feeding of the material will be stopped, as soon as the support is lifted by means of the connecting rod 4 and the co-operating levers 5, 6.

When beginning the press work, the metal 18 is inserted between the feed rollers 19 shown in Fig. 6 nearest the right, whereby the feed rollers, as soon as they are actuated by the connecting rod 22 and the intermediate gearing, will feed as long a portion of the'metal between the tool section 24, as the position of the crank pin 22 on the slotted disc 21 permits.

The support 12, actuated by the connecting rod 4, will, due to the rotation of the crank shaft 2, lift and approach the lower part 14 of the tool to the upper part 15, and thereby effect press work upon opposite sides of the metal 18, which has been fed between the tool. During the rotation of the crank shaft 2, the support 12 will by the described means be lowered again, whilst at the same time the feed rollers are actuated so that they feed a further portion of metal into the tool, and upon further rotation of the crank shaft, the new introduced portion of the metal will be subjected to press Work by the portion at the entrance end of the tool. At the same time the before-treated portion of the metal will be subjected to press Work by a corresponding adjacent portion of the tool. Thus, according to the feeding, all material fed into thepress will gradually be treated by different portions of the tool. If these tools are divided into a more or less great number of sections, the feed rollers interposed between two adjacent sections can feed the metal from the preceding section into the next following.

In Fig. 8 of the drawings a sheet metal 18 provided with a pressed or bent border is illustrated and in Figs. 9 to 14 the tools which have proved to be particularly suitable for performing this kind of Work are shown in diagrammatic vertical sections. By means of these tools, metal, the size of which is only limited by its own nature and by that of the manufacturing process, can be treated in almost unlimited lengths.

According to the embodiment shown in Figs. 9 to 14, the tool is for practical reasons divided into three sections 24, 25, 26 and the sheet metal 18 1s carried on a table not shown in the drawings, which table can be provided with conveying rollers or the like, so as to facilitate feeding. By hand orby automatically working means the sheet 18 is fed to the first pair of feed rollers 19, whereby the sheet can be fixed in a guiding device of any suitable design so as to prevent the sheet from turning aside from the straight line during feed- Near the entrance end, at AA in Fig. 6, the tool section 24 has in vertical cross-section the shape as shown in Fig. 9, gradually is changing into the shape lshownd'n Fig. v (cross section taken at B-''B in .Fig. 16.). If the crank pin 22 isadjusted for feeding. for. instance portions of 1" length of the material at each stroke of the connecting rod23', each'portion of :1! in length of the tool section :24 will gradually exert pressing work upon corresponding portions of the gradually fed metal 18.

In order to facilitate the transformation in shape, a member 27, cylinder or roller shaped, is pivotably journalled in a corresponding groove in the member 14, which latter can .be'made of cast steel or other inexpensive material, whilst the member '27 and the corresponding co-operating portion of the upper part suitably .are made of tool steel, high speed steel or any other material offering high resistance towear. After having been subjected to a preliminary transformation .duringitspassage through the first section 24 of the tool, the metal 18 will be fed by means of the second pair of feed rollers 19 into thesecond section 25, where it issubjected to a further gradually progressing transformation. The shape near the entrance end (at line C-C' in Fig. 6) and near the opposite end (at line D-D in Fig. 6) of this second tool section is shown in Figs. 11 and 12 in vertical cross section and the change from one shape into the other issmooth and gradual. g

During the gradual step by step passage through this section 25, the intermediate tool-member'29 provided with inclined sliding surfaces will exert a pressure upon the vertical portion of the metal 18, and due to the co-operation of the said member 29 with the upper part 15 and the lower part 14 of the tool, the sheet will be transformed gradually into the shape shown in Fig. 12..

The lower part 14 of the second as well as OI the third section 26 consists of three prismatic members, all of them being provided with inclined sliding surfaces: The lower part 14 which in the said sections only has to affix the metal 18 to the upper part 1'5. A prismatic member 30, provided at the bottom of the groove in thesupport 12, which member by means of its one inclined side and due to the action of a pin 32' actuated by a spring 31, tends to lift the lower part 14' and to approach it to the upper part 15 of. the tool. Finally another prismatic member 33 which 15 slidable upon one vertical wall of the said groove, opposite to that upon which the member .14 can slide. One inclined surface of the said member 33 co-operates with a correspondingly inclined surface on themember '30, whilst the other inclined surface of the member 33 co-operates with the before mentioned member 29.

When lifting the support 12, the intermediate member 29 will slide along the inclined surfaces of the upper part 15 and of the prismatic me1nber 33, and will be forced against the metal .13,

which thereby gradually will be bent into the shape shown in Fig. 12, whereafter the metal is fed, by means of the third pair of feed rollers 19, into the third section 26 of the tool. This latter section has, near the entrance end (at E-E in Fig. 6), a cross section .as shownin Fig. 13,, which smoothly and gradually changes into the shape near the opposite end as shown in Fig.1-i (at F--F in Fig. 6).

In order to perform the last step, viz: bending down the diagonally upwards directed por tion of the sheet border, theintermediate men-l her 29 co-operates with a member 29a sliding between said member andthe part 15. By means of this member 29a the said border edge is forced downward around a mandrel 34, slidably ar-' ranged in the member 29', whilst at the same time the mandrel '34 eifectspress work upon the vertical portion: of the metal 13 imparting to the same the desired'S-s'hape. The nearer the metal is fed to the end ofthe section 26, the more L All resistant materialas for'instance: tool steel or high speed steel or the like.

The metal l8 in strips of considerablelength is fed in quite the same manner as described before into the tool by means of the feed rollers 19, and will in'the first section 24, gradu'allybe brought into the shape shown in Fig. 17. The secondsection 25 will transform the shape shown. in Fig. '18 into the intermediate shape of Fig. 19 and in the third section26 the metal 18 willbe transformed. from the shape shown in Fig. 20 into its final shape shown in Fig. .15. The Figs; 16 to 21 are vertical crosssections through the different tool sections 24, 25,26 at the lines A--A, B-B, C--C, D--D, E-'E and FF of Fig. 6 respectively.

According to this embodiment, the tool suitable for the manufacture of the shape shown in Fig. 15,"has in the lowerpart14 of all sections 124, 25, 26 a V-shaped cross section. In the plane bottom of the V-shapedgroove there is provided at suitable intervals .a number of bores 35, whilst the operating member 36 is provided with pins 37, fitting the said boresand forming guide means for the member. 3.6. Springs 38 are provided in the bores 35, whichtend to push the member 3.6 in an upward direction,

uThe working portion of: the upper'part 15 consistsof two" members 39., to, the outer inclined surfaces of which fit the V.-groove in the lower part 14, and during the reciprocating movements of the support l2'slide in the said groove.

In Fig. 2 2Jis shown another design of a shaped borderflof 5 sheet metal, which can be treated in a toolwirhgradually changing cross sections as shown in Figs. 23 to so (taken at vA-A to F-F respectively in Fig. '6). The tool is divided into three sections 2e, '25, 26. Fig. 23 shows the-vertical cross section of the first tool section 24 near the entrance end, while Fig. 24 represents a cross section taken approximately at the center of said tool section, and Fig. shows the shape of the tool insection taken at B- B in Fig. 6.

During the passage through the first tool section 24, the plane sheet metal is gradually transformed into the shape shown in Fig. 25 with the outer edge bent diagonally downwards. Similar to thetool described before in connection with Figs. 9 and 10, also in the present case the tool Fig. v26 shows the shape of the member 29. at the entrance end. i

Figs. 28, 29 and 30 represent vertical cross sections through the third tool section 26, taken near the entrance end, at about half its length and near the outlet end of-thetool respectively. Also this tool section is provided with a pivotal cylindrical member 27 provided in the lower part 14, which member'27 co-operates with a similar pivotal cylindrical member 41 arranged in the upper part 15 of this toolsection. The said devices 2? and 41 will highly facilitate the bending work to be performed.

For the manufacture of mouldings as shown in Fig. 31, a set of tools can be employed, the vertical cross sections of which are illustrated in Figs. 32 to 3'7.

The different sections of the tool operate according to the same principle as described before only that in thepresent instance the last section 26 of the tool, depending upon the shape of the finished strip metal, is somewhat more intricat than the above described tools.

As will be seen from Figs. 36 and 37, which represent diagrammatical cross-sections of the last section of tool 26 near the entrance and outlet respectively (lines E-E and F-F respectively in Fig. 6), the upper part 15 of this section is provided with a cylindrical member 41 intended to perform the rolling operation of one edge of the strip metal 18, for which purpose the member 41 is pivotal in a corresponding groove in the upper part 15. The pivoting motion of the member 41 is effected by the lower part 14 by means of a semi-cylindrical member 42, to which the movement of part 14 is imparted by a number of bolts 42a or the like, inserted in a member 42b affixed to the upper part 15 of the tool. Thereby the member 42 will turn over the edge of the plate around the mandrel 43.

In order to facilitate this operation, the tool sec tion 26 is provided with mandrels 43, 44, around which the edges are rolled in, so that. they form uniform, equally round, rolls. Those mandrels suitably form integral parts of the member 28 of the preceding tool section 25 and extend between the following adjacent tool parts 14 and 15.

As mentioned above, all parts of the tools subiected to Wear are suitably made of tool-steel, high speed steel or like material and are afiixed to the corresponding parts 14 and 15 of thetool by means of screws, bolts or the like, provided they-are not slidable or pivotal, so that they can easily be changed. The fixing devices are not shown in the drawings, as the design and the use of those parts will be clearly understood by any skilled tool maker.

In the same manner the feeding rolls can be easily changed and replaced by others, the rolling surface of which fits to the shape of the intermediate stages of the metal to be treated.

The above described apparatus for pressing or bending sheet or strip metal gradually, in a step wise operation is not limited to the embodiments described, the details of which'can be subjected to variations without departing from the scope and spirit of the invention. Thus the tool can consist of a single tool with two or more co-operating parts, but it can also consist of a plurality of sections of varying length. Nor is the invention limited to a press of the design as shown and described, but can consist of any suitable construction either upright or horizontal or inclined. The moving tool holder can be placed above the stationary tool-holder as generally done in presses of ordinary construction.

Having now described myinvention, what I claim as new and desire to secure by Letters Patent is:

1. In a device for shaping sheet metal, the combination of a reciprocating press, feeding means for a sheet, and shaping tools for producing a gradually progressing bending of the sheet along a transverse section with respect to the direction of feeding movement of thesheet, said tools comprising a plurality of sections, each thereof consisting of a plurality of supports and tool members therefor, one of the latter being self-adjustable with respect to its support and adapted to perform a working movement in its self-adjustment by pressure exerted against itduring reciprocation of the press.

2. In a device for shaping sheet metal, the combination of a reciprocating press, feeding means for a sheet, and shaping tools for producing a gradually progressing bending of the sheet along a transverse section'with respectto the direction of feeding movementof the sheet, said tools, comprising a support, a self-adjustable tool rotatably mounted in the support and provided with a working face, and a reciprocating member movable towards said rotatably mounted tool to cause working movement thereof by pressure exerted against the working face during reciprocation of the member.

3. In a device for shaping sheet metal, the combination of a reciprocating press, feeding means for a sheet, and shaping tools for producing a gradually progressing bending of the sheet along a transverse section with respect to the direction of feeding movement of the sheet, said tools, comprising a stationar support, a selfadjustable tool rotatably mounted in the support and provided with a working face, and a reciprocating member movable towards said rotatably mounted tool to cause working movement thereof by pressure exerted against the working face during reciprocation of the member.

4. In a device for shaping sheet metal, the combinationof a reciprocating press, feeding means fora sheet, and shaping tools forproducing a gradually progressing bending of the sheet along a transverse section with respect to the direction of feeding movement of the sheet, said tools, comprising supports, and self-adjustable tool members comprising prismatic bodies having inclined surfaces including working faces and being freely mounted in their supports and held in place between working periods by gravity.

5. In a device for shaping sheet metal, the combination of a reciprocating press, feeding means for a sheet, and shaping tools for producing a gradually progressing bending of the sheet along a transverse section with respect to the direction of feeding movement of the sheet, said tools comprising a stationary upper tool support and a reciprocating lower tool support cooperating with the first support, a plurality of tool members in said lower support, a plurality of self-adjustable tool members for said upper tool support adapted to make a working movement in cooperation with the tool members of the reciprocating lower support.

6. In a device for shaping sheet metal, the combination of a reciprocating press, feeding means for a sheet, and shaping tools for producing a gradually progressing bending of the sheet along a transverse section with respect to the direction of feeding movement of the sheet, said tools comprising a stationary upper tool support and a reciprocating lower tool support cooperating with the first support, a plurality of self-adjustable tool members arranged in the upper tool support, said members comprising prismatic bodies having inclined surfaces including a working face for performing a working movement by pressure from the lower support.

7. In a device for shaping sheet metal, the combination of a reciprocating press, feeding means for a sheet, and shaping tools for producing a gradually progressing bending of the sheet along a transverse section with respect to the direction of feeding movement of the sheet, said tools com prising a stationary upper tool support and a reciprocating lower tool support cooperating with each other, said upper tool support having a plurality of self-adjustable tool members constituting pivotal members journaled in the upper support and provided with a working surface which performs a working movement by pressure from the lower support.

8. In a device for shaping sheet metal, the combination of a reciprocating press, feeding means for a sheet, and shaping tools for producing a gradually progressing bending of the sheet along a transverse section with respect to the direction of feeding movement of the sheet, said tools, including reciprocating and stationary tool supports, prismatic members having inclined surfaces, and being located respectively in the reciprocating tool support and in the stationary tool support, the said prismatic members contacting the sheet and being adapted to transfer worklng movements to said members in the stationary sup port.

9. In a device for shaping sheet metal, the combination of a reciprocating press, feeding means for a sheet, and shaping tools for producing a.

gradually progressing bending of the sheet along a transverse section with respect to the direction of feeding movement of the sheet, said tools com- 1 prising reciprocating and stationary tools supports, pivotal members disposed in the stationary support and pressing'means cooperating therewith and adapted to impart pressure to the sheet in a direction other than that of the working movement of the reciprocating tool support.

10. In a device of the class described, a stationary tool support provided with shaping tools, a movable tool support, means for moving a sheet, and a plurality of prismatic tool members located in the moving tool support and adapted to move one anothertransversely to the feed direction of the sheet and angularly and parallel to the moving direction of the moving tool supp rt when the moving tool support advances towards the sheet and when one of the prismatic members contacts a portion of the stationary shaping tools.

11. In a device for shaping sheet metal, the combination of a reciprocating press, feeding means for a sheet, andshaping tools for producing a gradually progressing bending of the sheet along a transverse section with respect to the direction of feeding movement of the sheet, said tools comprising a reciprocating lower tool support and a knee joint to reciprocate the support, a connecting rod for the said knee joint, the latter carrying the said support and being held in place partly by the-gravity of the support and partly by the said connecting rod which is adapted to give the knee joint a reciprocating movement transversely with respect to the direction of the movement of the support.

12. In a device of the class described, a reciprocating lower tool support and a knee joirit to reciprocate the support, further a connecting rod for the said knee joint, the latter carrying the said support and being held in place partly by the gravity of the support and partly by the I said connecting rod which is'adapted to give the knee joint a reciprocating movement transversely with respect to the direction of the movement of the support, and means for adjusting the working height of the reciprocating tool support, which consists of a slide engaging the lower tongued bearing for the knee joint with a diagonal groove, said tongue engaging the groove to displace the bearing and adjust the inclined position of the lower knee joint lever.

13. In a device of the class described, a reciprocating lower tool support and a knee joint to reciprocate the support, further a connecting rod. for the said knee joint, the latter carrying the said support and being held in place partly by the gravity of the support and partly by the said connecting rod which is adapted to give the knee joint a reciprocating movement transversely with respect to the direction of the movement of the support, and means for adjusting the working height of the reciprocating tool support, which consists of a sliding wedge plate on which the lower bearing of the knee joint rests.

CARL GUSTAF LEONARD SJ6LANDER. 

